/*******************************************************************************
 * Copyright 2020 huanggefan.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package core

import (
	"crypto/md5"
	"crypto/sha1"
	"crypto/sha256"
	"crypto/sha512"
	"encoding/hex"
	"hash"
)

const (
	_MD5 int = iota
	_SHA1
	_SHA256
	_SHA512
)

// 32
func StringToMD5(v string) (c string) {
	return stringToSha(v, _MD5)
}

// 40
func StringToSha1(v string) (c string) {
	return stringToSha(v, _SHA1)
}

// 64
func StringToSha256(v string) (c string) {
	return stringToSha(v, _SHA256)
}

// 128
func StringToSha512(v string) (c string) {
	return stringToSha(v, _SHA512)
}

func stringToSha(v string, shaType int) (c string) {
	var sum hash.Hash

	switch shaType {
	case _MD5:
		sum = md5.New()
	case _SHA1:
		sum = sha1.New()
	case _SHA256:
		sum = sha256.New()
	case _SHA512:
		sum = sha512.New()
	default:
		sum = md5.New()
	}

	sum.Write([]byte(v))
	c = hex.EncodeToString(sum.Sum(nil))
	return c
}
